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arXiv 1409.7013quant-phcond-mat.stat-mechcond-mat.str-el
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利用空间群对称性数值检测对称性丰富的拓扑相

Numerical detection of symmetry enriched topological phases with space group symmetry

Ling Wang, Andrew Essin, Michael Hermele, Olexei Motrunich

摘要:

物质的拓扑有序相,特别是所谓的对称性富集拓扑(SET)相,可以在存在全局对称性的情况下表现出量子数分数化。在二维Z_2拓扑有序态中,作用于任意子的基本平移T_x和T_y既可以对易,也可以反对易。这种性质,晶体动量分馏,可以看到在布里渊区的激发态光谱的周期性。我们提出了一种数值方法来检测这种形式的对称性富集的存在下,给定一个投影纠缠对态(PEPS),我们研究了一个圆柱体的传输矩阵的相关长度的频谱的最小值。作为一个基准,我们证明了我们的方法使用修改后的复曲面代码模型与扰动。增强的动量周期性清楚地揭示了系统中相应准粒子的反对易关系{T_x,T_y}=0$。

英文摘要:

Topologically ordered phases of matter, in particular so-called symmetry enriched topological (SET) phases, can exhibit quantum number fractionalization in the presence of global symmetry. In Z_2 topologically ordered states in two dimensions, fundamental translations T_x and T_y acting on anyons can either commute or anticommute. This property, crystal momentum fractionalization, can be seen in a periodicity of the excited-state spectrum in the Brillouin zone. We present a numerical method to detect the presence of this form of symmetry enrichment given a projected entangled pair state (PEPS); we study the minima of spectrum of correlation lengths of the transfer matrix for a cylinder. As a benchmark, we demonstrate our method using a modified toric code model with perturbation. An enhanced periodicity in momentum clearly reveals the anticommutation relation {T_x,T_y}=0$ for the corresponding quasiparticles in the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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